CN114577900A - Plug-in electromagnetic ultrasonic guided wave phased array probe for pipeline and detection system - Google Patents
Plug-in electromagnetic ultrasonic guided wave phased array probe for pipeline and detection system Download PDFInfo
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- CN114577900A CN114577900A CN202210211988.0A CN202210211988A CN114577900A CN 114577900 A CN114577900 A CN 114577900A CN 202210211988 A CN202210211988 A CN 202210211988A CN 114577900 A CN114577900 A CN 114577900A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides an insertion type electromagnetic ultrasonic guided wave phased array probe for a pipeline and a detection system, which are used for long-distance and large-range detection of defects of a small-diameter metal bent pipe. The whole structure of the probe is in a long cylindrical shape and consists of an annular transceiving coil array, an annular magnet, an annular magnetic conduction core, an axial fastener, a centering conical block and a signal connecting wire; the matched detection system consists of a probe, a multi-channel high-voltage serial pulse excitation module, a multi-channel preamplification module, a multi-channel time sequence control module, a multi-channel signal acquisition card and a control computer. During detection, the probe is inserted from the opening end part of the bent pipe, the probe does not need to be in contact with the pipe wall, excitation and receiving of ultrasonic guided waves are achieved through electromagnetic induction, and guided wave signals are enhanced through multi-channel array delay triggering and delay superposition. The probe and the detection system can obviously enhance the strength of ultrasonic guided wave signals, simultaneously reduce the interference of other modes and frequency dispersion, and greatly improve the detection distance and the defect detection capability in the bent pipe.
Description
Technical Field
The invention relates to the technical field of pipeline defect detection, in particular to an insertion type electromagnetic ultrasonic guided wave phased array probe for a pipeline, a matched electromagnetic ultrasonic guided wave phased array detection system and a detection method, which can be used for detecting defects of a small-diameter metal bent pipe with a complex bending structure and densely arranged in a long distance and a large range.
Background
For example, a metal small-diameter bent pipe such as a heat exchange pipe of a steam generator is one of core components of a nuclear power station, and the bent pipe is subjected to corrosion of high-temperature gas and steam, thermal stress, strong radiation and the like when working in a severe environment for a long time, and is easy to generate cracks and corrosion defects. Because the arrangement is dense, the pipeline trend is complex, a large number of bending sections and spiral pipe sections exist, and a high-efficiency and feasible locatable nondestructive detection means aiming at the volume type defect does not exist at present. As a novel nondestructive testing technology, the ultrasonic guided wave detection technology utilizes the characteristic that ultrasonic guided waves can be propagated along the axial direction of a pipeline in a long distance, and the global detection of the pipeline in the long distance range can be realized through the single-point detection of a probe. The ultrasonic guided wave technology not only has the advantages of high detection efficiency, large detection range and the like, but also can finish the detection of the bent pipe and has stronger geometric adaptability.
At present, a coupling agent is required to be applied to the surface of a test piece by a common piezoelectric contact probe for pipeline guided waves, effective coupling between the probe and the surface of the test piece is required to be ensured, the requirement on the surface of a detection object is high, and the installation and arrangement steps are complex. The electromagnetic ultrasonic probe is in a non-contact type, a coupling agent is not needed during use, the requirement on the surface of a test piece is low, the installation and the arrangement are convenient, and the equipment complexity and the operation difficulty for realizing automatic detection are low. The ultrasonic guided wave detection method based on the electromagnetic ultrasonic probe has a good application prospect for detecting defects in complex pipelines. However, the electromagnetic ultrasonic probe has the disadvantage of low detection signal-to-noise ratio, and the effective detection distance of the probe in the bent pipe is limited due to severe wave packet diffusion caused by attenuation and dispersion of ultrasonic guided waves propagated in the long-distance bent pipe. Therefore, the portable probe with the long-distance detection capability for the bent pipe, the matched detection system and the detection method are provided, and the detection system and the detection method have important significance for realizing the volume type defect detection of the metal small-diameter bent pipe such as a heat exchange pipe of a steam generator and the like.
Disclosure of Invention
The invention aims to provide a non-contact plug-in electromagnetic guided wave phased array probe and a detection system which are convenient to arrange, good in detection accessibility, long in detection distance, high in detection signal-to-noise ratio and high in sensitivity and are used for long-distance detection of a metal small-diameter bent pipe.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an insertion type electromagnetic ultrasonic guided wave phased array probe for a pipeline is composed of an annular transmitting and receiving coil 1, an annular magnet 2, an annular magnetic core 3, an axial fastener 4, a centering conical block 5 and a signal connecting wire 6; the annular magnet 2 and the annular magnetic conduction cores 3 are alternately arranged in the axial direction, the annular transceiving coils 1 are tightly wound on the outer sides of the annular magnetic conduction cores 3 to form an annular transceiving coil array, the annular magnet 2 and the annular magnetic conduction cores 3 are restrained and reinforced by the axial fastening piece 4, the centering conical block 5 is arranged at the end part of the axial fastening piece 4, and the signal connection line 6 is led out by the annular transceiving coils 1, penetrates out of a central through hole of the axial fastening piece 4 and is converged into a cable.
The annular magnets 2 are permanent magnets or electromagnet coils, the magnetic pole directions of adjacent magnets are the same in pairs or opposite in pairs, and axial or radial magnetic fields along the pipeline are respectively provided for the annular transceiving coils 1; the single annular transceiving coil 1 and the adjacent annular magnet 2 form a probe array element and are arranged into an axial array, and the central distance d between the adjacent annular transceiving coils, the relative delay delta t of the adjacent channel trigger delay sequence and the axial guided wave group speed c meet the relation: and delta t is d/c.
A plug-in type electromagnetic ultrasonic guided wave phased array detection system for a pipeline comprises a multi-channel high-voltage serial pulse excitation module 7, a multi-channel preamplification module 8, a multi-channel time sequence control module 9, a multi-channel signal acquisition card 10, a control computer 11 and a plug-in type electromagnetic ultrasonic guided wave phased array probe, wherein a circumferential receiving and transmitting coil array of the plug-in type electromagnetic ultrasonic guided wave phased array probe is connected with each channel in the multi-channel high-voltage serial pulse excitation module 7 and the multi-channel preamplification module 8 one by one, the multi-channel time sequence control module 9 is connected with the multi-channel high-voltage serial pulse excitation module 7 in a triggering mode, the input end of the multi-channel signal acquisition card 10 is connected with each channel of the multi-channel preamplification module 8 one by one, the output end of the multi-channel signal acquisition card 10 is connected with the input end of the control computer 11, the output end of the control computer 11 is connected with the multi-channel high-voltage serial pulse excitation module 7, the multi-channel pre-amplification module 8, A multi-channel preamplification module 8 and a multi-channel time sequence control module 9;
during detection, firstly, an insertion type electromagnetic ultrasonic guided wave phased array probe is inserted from an opening at the end part of a detected bent pipe until all annular transceiving coils 1 of the probe are completely arranged in the bent pipe; the multi-channel time sequence control module 9 sequentially triggers the multi-channel high-voltage serial pulse excitation module 7 to output high-frequency pulse current to each array element of the annular transceiving coil array according to the moving time sequence, sequentially induces eddy currents or dynamic magnetic fields 14 on the pipe wall, and interacts with a bias magnetic field 13 generated by the annular magnet 2 to generate electromagnetic force, so that an ultrasonic guided wave pulse sequence is excited in the pipe wall below each array element of the annular transceiving coil array according to a certain time sequence, the ultrasonic guided wave pulse sequences excited by each array element generate in-phase superposition to form enhanced ultrasonic guided wave pulse, and the generation of other guided wave modes with different wave speeds is inhibited; the enhanced ultrasonic guided wave propagates in the pipeline and meets the enhanced pulse echo generated by the defect and acts with the bias magnetic field 13 to form an induced electromagnetic field which is sequentially received by each array element of the annular transceiving coil array, the induced electromagnetic field is amplified by the multichannel preamplification module 8 and converted into a digital signal by the multichannel signal acquisition card 10 and is transmitted into the control computer 11 for acquisition, finally, the obtained multichannel guided wave detection signals are subjected to delay superposition to form an electromagnetic ultrasonic guided wave phased array detection enhanced signal, and the frequency dispersion effect of the guided wave and the interference of other different wave velocity guided wave modal signals are further inhibited while the detection signal is enhanced.
The multi-channel high-voltage serial pulse excitation module 7 outputs square wave or sine wave serial pulse with high-voltage kHz frequency; the number of the channels of the multi-channel time sequence control module 9 is consistent with that of the multi-channel high-voltage serial pulse excitation module 7, and the number of the channels of the multi-channel preamplification module 8 is consistent with that of the multi-channel signal acquisition card 10.
The connection mode of each array element of the probe with the multi-channel high-voltage serial pulse excitation module 7 and the multi-channel preamplification module 8 adopts a mode that one part of array elements are connected and excited, the other part of array elements are connected and received, or all the array elements are simultaneously excited and received, and a multi-channel duplexer is added in a detection system to realize the connection and combination of excitation and reception; when the detection system is connected with the continuous annular transmitting and receiving coil 1 array element, the final superposed signal Sig (t) and the ith channel receiving signal si(t) the delay superimposing process satisfies the relation:
the invention provides a novel electromagnetic ultrasonic guided wave phased array probe for detecting long-distance defects of a metal small-diameter bent pipe, a matched detection system and a detection method thereof. The invention combines the advantages of ultrasonic guided wave, electromagnetic ultrasonic probe and ultrasonic phased array detection, the probe has the advantages of non-contact, convenient arrangement in the pipeline, good detection accessibility and the like, and the detection means can greatly improve the amplitude of the guided wave detection signal after focusing through the ultrasonic phased array, thereby improving the detection range, the signal-to-noise ratio and the detection sensitivity.
Drawings
FIG. 1 is a schematic diagram of an axial section sectional view of an insertion type electromagnetic ultrasonic guided wave phased array probe structure for a pipeline and a phased array detection system connected with the axial section sectional view.
FIG. 2 is a schematic diagram of the phased array principle of the guided wave excitation and echo signal detection of the probe of the present invention.
Fig. 3 is a schematic view of the arrangement of the probe of the present invention in a pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the invention provides an insertion type electromagnetic ultrasonic guided wave phased array probe for a pipeline for long-distance detection of a metal small-diameter bent pipe, which consists of an annular transceiving coil 1, an annular magnet 2, an annular magnetic conduction core 3, an axial fastener 4, a centering conical block 5 and a signal connecting wire 6. The annular magnets 2 and the annular magnetic conduction cores 3 are alternately arranged in the axial direction, the annular transceiving coils 1 are tightly wound on the outer sides of the annular magnetic conduction cores 3 to form an annular transceiving coil array, the annular magnets 2 and the annular magnetic conduction cores 3 are restrained and reinforced by the axial fastening piece 4, the centering conical block 5 is arranged at the end part of the axial fastening piece 4, and the signal connection line 6 is led out by the annular transceiving coils 1 and penetrates out through a central through hole of the axial fastening piece 4. The magnetizing direction of the annular magnet 2 of the probe is along the axial direction of the magnet, and the magnetic pole directions of adjacent magnets are the same or opposite in pairs. The Lorentz force mechanism adopts the way that the magnetic poles of adjacent magnets are arranged in opposite directions to obtain a radial bias magnetic field, and the magnetostriction mechanism adopts the way that the magnetic poles are arranged in the same direction to obtain an axial bias magnetic field. The detection principle of the probe is as follows: after the power is switched on, eddy current fields 14 and dynamic magnetic fields 15 which are axially symmetrically distributed are induced on the near surface of the inner wall of the pipeline by the annular transceiving coils 1 of each unit in the array, the eddy current fields interact with a bias magnetic field 13 provided by the annular magnet 2, Lorentz force or magnetostrictive force is generated in the near surface area of the inner wall of the pipeline based on the Lorentz force or magnetostrictive mechanism and is used for exciting ultrasonic waves, and echoes can be received by the coils through an inverse effect. The annular transceiving coil arrays are uniformly distributed along the axial direction of the probe, and the center distance d between adjacent coils, the relative delay delta t between adjacent channels and the axial ultrasonic guided wave group velocity c meet the relationship: and delta t is d/c.
And inserting the plug-in electromagnetic ultrasonic guided wave phased array probe from the opening at the end part of the detected bent pipe until all the annular transceiving coils 1 of the probe are completely arranged in the bent pipe. And each array element of the annular transceiving coil array is simultaneously connected with each channel in the multi-channel high-voltage serial pulse excitation module 7 and the multi-channel preamplification module 8 one by one. When the device works, the multichannel time sequence control module 9 sequentially triggers the multichannel high-voltage serial pulse excitation module 7 to output high-frequency pulse current to each array element of the annular transceiving coil array according to the moving time sequence, eddy current fields 14 or dynamic magnetic fields 14 which are axially symmetrically distributed are sequentially induced on the tube wall, and the high-frequency pulse current interacts with a bias magnetic field 13 generated by the annular magnet 2 to generate electromagnetic force, so that an ultrasonic guided wave pulse sequence is excited in the tube wall below each array element of the annular transceiving coil array according to a certain time sequence, the ultrasonic guided wave pulse sequences excited by each array element are superposed in the same phase to form enhanced ultrasonic guided wave pulse, and the generation of other different wave velocity guided wave modes is inhibited. The enhanced ultrasonic guided wave propagates in the pipeline and meets the enhanced pulse echo generated by the defect and acts with the bias magnetic field 13 to form an induced electromagnetic field which is sequentially received by each array element of the annular transceiving coil array 1, the induced electromagnetic field is amplified by the multichannel preamplification module 8 and converted into a digital signal by the multichannel signal acquisition card 10 and is transmitted into the control computer 11 for acquisition, finally, the obtained multichannel guided wave detection signals are subjected to delay superposition to form an electromagnetic ultrasonic guided wave phased array detection enhanced signal, and the frequency dispersion effect of the guided wave and the interference of other different wave velocity guided wave modal signals are further inhibited while the detection signal is enhanced.
The probe and detection system are described in further detail below with reference to figures 2, 3 and the specific embodiments.
An insertion type electromagnetic ultrasonic guided wave phased array probe, a detection system and a method for a pipeline specifically comprise the following steps:
the method comprises the following steps: as shown in figure 3, the plug-in electromagnetic ultrasonic guided wave phased array probe 19 is placed into the opening of the pipe end until all the annular transmitting and receiving coils 1 of the probe are completely placed in the elbow. After the ultrasonic guided wave 12 is excited to encounter the defect 18, a defect echo 17 is generated and is received by each array element 16 in the probe, and the defect in the pipeline can be positioned and quantitatively detected by detecting the defect echo.
Step two: the control computer 11 controls the multi-channel time sequence control module 9 to output a trigger signal with a set relative delay, and triggers the multi-channel high-voltage serial pulse excitation module 7 to output high-frequency strong pulse serial current to be led into the annular transceiving coil array. The annular transceiving coils 1 of each unit in the array excite the ultrasonic guided waves 12 which axially propagate along the pipeline based on Lorentz force or a magnetostriction mechanism. The reflected defect echo 17 is then received by the probe based on the lorentz force and the inverse effect of the magnetostrictive mechanism.
Step three: as shown in fig. 2, excited in the inner wall of the pipeThe ultrasonic guided wave 12 of (2) is propagated along the axial direction, under the condition that the time delay is ensured to meet the condition that delta t is d/c, the ultrasonic guided wave 12 excited by each array element 16 can be superposed at the same position in the axial direction, so that the ultrasonic guided wave signal is enhanced to form enhanced ultrasonic guided wave pulses. The time interval between the arrival of the echo 17 at each array element 16 also satisfies Δ t ═ d/c. The defect echo 17 is converted into an induced voltage signal by a probe, amplified by a multi-channel preamplification module 8, introduced into a multi-channel signal acquisition card 10 to be converted into a digital signal, transmitted into a control computer 11 to be subjected to time-delay superposition processing, and finally subjected to superposition signal Sig (t) and channel i receiving signal si(t) the delay superimposing process satisfies the relation:
Claims (5)
1. the utility model provides a bayonet electromagnetic acoustic guided wave phased array probe for pipeline which characterized in that: the probe consists of an annular transceiving coil (1), an annular magnet (2), an annular magnetic conduction core (3), an axial fastener (4), a centering conical block (5) and a signal connecting wire (6); annular magnet (2) and annular magnetic conduction core (3) are arranged at axial alternation, a plurality of ring send-receiver coil (1) closely form ring send-receiver coil array around arranging in annular magnetic conduction core (3) outside, axial fastener (4) retrain and consolidate annular magnet (2) and annular magnetic conduction core (3), centering toper piece (5) set up in axial fastener (4) tip, signal connection line (6) are drawn forth by ring send-receiver coil (1) and are worn out and assemble into the cable through the central through-hole of axial fastener (4).
2. The inserted electromagnetic ultrasonic guided-wave phased array probe for the pipeline according to claim 1, characterized in that: the annular magnets (2) are permanent magnets or electromagnet coils, the magnetic pole directions of adjacent magnets are the same in pairs or opposite in pairs, and axial or radial magnetic fields along the pipeline are respectively provided for the annular transceiving coils (1); a single annular transceiving coil (1) and an adjacent annular magnet (2) thereof form a probe array element and are arranged into an axial array, and the central distance d between the adjacent annular transceiving coils, the relative delay delta t of the adjacent channel trigger delay sequence and the axial guided wave group velocity c satisfy the relation: and delta t is d/c.
3. The utility model provides a bayonet electromagnetic acoustic guided wave phased array detecting system for pipeline which characterized in that: the multi-channel high-voltage series pulse excitation system comprises a multi-channel high-voltage series pulse excitation module (7), a multi-channel preamplification module (8), a multi-channel time sequence control module (9), a multi-channel signal acquisition card (10), a control computer (11) and the plug-in type electromagnetic ultrasonic guided wave phased array probe of claim 1. The annular transceiving coil array of the plug-in electromagnetic ultrasonic guided wave phased array probe is connected with each channel in a multi-channel high-voltage serial pulse excitation module (7) and a multi-channel preamplification module (8) one by one, a multi-channel time sequence control module (9) is connected with the multi-channel high-voltage serial pulse excitation module (7) in a triggering mode, the input end of a multi-channel signal acquisition card (10) is connected with each channel of the multi-channel preamplification module (8) one by one, the output end of the multi-channel signal acquisition card (10) is connected with the input end of a control computer (11), and the output end of the control computer (11) is connected with the multi-channel high-voltage serial pulse excitation module (7), the multi-channel preamplification module (8) and the multi-channel time sequence control module (9);
during detection, firstly, an insertion type electromagnetic ultrasonic guided wave phased array probe is inserted from an opening at the end part of a detected bent pipe until all annular transceiving coils (1) of the probe are completely arranged in the bent pipe; the multichannel time sequence control module (9) sequentially triggers the multichannel high-voltage series pulse excitation module (7) to output high-frequency pulse current to each array element of the annular transceiving coil array according to the moving time sequence, sequentially induces eddy currents or dynamic magnetic fields (14) on the tube wall, and interacts with a bias magnetic field (13) generated by the annular magnet (2) to generate electromagnetic force, so that ultrasonic guided wave pulse sequences are excited on each array element of the annular transceiving coil array according to a certain time sequence, the ultrasonic guided wave pulse sequences excited by each array element are superposed in the same phase to form enhanced ultrasonic guided wave pulses, and the generation of other guided wave modes with different wave speeds is inhibited; the enhanced ultrasonic guided wave propagates in the pipeline and meets the enhanced pulse echo generated by the defect and acts with the bias magnetic field (13) to form an induced electromagnetic field which is sequentially received by each array element of the annular transceiving coil array, the induced electromagnetic field is amplified by the multi-channel preamplification module (8) and converted into a digital signal by the multi-channel signal acquisition card (10), the digital signal is transmitted into the control computer (11) for acquisition, finally, the obtained multi-channel guided wave detection signals are subjected to delay superposition to form an electromagnetic ultrasonic guided wave phased array detection enhanced signal, and the frequency dispersion effect of the guided wave and the interference of other different wave velocity guided wave mode signals are inhibited.
4. The inserted electromagnetic ultrasonic guided-wave phased array inspection system for pipelines of claim 3, wherein: the multichannel high-voltage serial pulse excitation module (7) outputs square wave or sine wave serial pulses with high-voltage kHz frequency; the number of the channels of the multi-channel time sequence control module (9) is consistent with that of the channels of the multi-channel high-voltage series pulse excitation module (7), and the number of the channels of the multi-channel preamplification module (8) is consistent with that of the channels of the multi-channel signal acquisition card (10).
5. The inserted electromagnetic ultrasonic guided-wave phased array inspection system for pipelines of claim 3, wherein: the connection mode of each array element of the probe with the multi-channel high-voltage series pulse excitation module (7) and the multi-channel preamplification module (8) adopts a mode that one part of array elements are connected for excitation and the other part of array elements are connected for receiving, or all the array elements are simultaneously excited and received, and a multi-channel duplexer is added in a detection system to realize the connection combination of excitation and receiving; when the detection system is connected with the array elements of the continuous annular transceiving coil (1), finally, signals Sig (t) and the ith channel receiving signal s are superposedi(t) the delay superimposing process satisfies the relation:
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290227A (en) * | 2022-10-10 | 2022-11-04 | 四川大学 | Method and device for detecting stress of shale gas pipeline in mountainous area |
| CN117233263A (en) * | 2023-11-15 | 2023-12-15 | 中北大学 | Narrow-sound-beam electromagnetic ultrasonic sensor and device for detecting defects in axial direction of pipeline |
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2022
- 2022-03-04 CN CN202210211988.0A patent/CN114577900A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290227A (en) * | 2022-10-10 | 2022-11-04 | 四川大学 | Method and device for detecting stress of shale gas pipeline in mountainous area |
| CN117233263A (en) * | 2023-11-15 | 2023-12-15 | 中北大学 | Narrow-sound-beam electromagnetic ultrasonic sensor and device for detecting defects in axial direction of pipeline |
| CN117233263B (en) * | 2023-11-15 | 2024-02-06 | 中北大学 | Narrow-sound-beam electromagnetic ultrasonic sensor and device for detecting defects in axial direction of pipeline |
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